ACPI / debugger: Fix a redundant mutex unlock issue in acpi_aml_open()

Fix a double mutex_unlock() issue where acpi_initialize_debugger() is
called with the mutex already unlocked.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/acpi/acpi_dbg.c b/drivers/acpi/acpi_dbg.c
index e8d1698c15bb..15e4604efba7 100644
--- a/drivers/acpi/acpi_dbg.c
+++ b/drivers/acpi/acpi_dbg.c
@@ -514,7 +514,7 @@ static int acpi_aml_open(struct inode *inode, struct file *file)
                 if (ACPI_FAILURE(status)) {
                         pr_err("Failed to initialize debugger.\n");
                         ret = -EINVAL;
-                        goto err_lock;
+                        goto err_exit;
                 }
                 pr_debug("Debugger thread initialized.\n");
 
@@ -531,6 +531,7 @@ err_lock:
                         acpi_aml_active_reader = NULL;
         }
         mutex_unlock(&acpi_aml_io.lock);
+err_exit:
         return ret;
 }